Controversial perhaps but get away from the main cycle area and explore other areas. If you've not done the verderers or Freeminers trails they are well worth doing and the Enduro course is fun but for me its not quite the same as riding single track somewhere quiet.
Hard to give specific places as the Forest can be quite bitty but get the local OS map and go exploring, you cant go to far wrong once you've sussed the contours. some of the best bits are around the edges of the forest, not the center so consider starting at Parkend and heading east or west (not up the main cycle path) or Cinderford north and west. Staunton to Symonds Yat can be good but busy at weekends. Watch out for horses and walkers and be sensible if its muddy on the paths. If you meet boar just leave them alone.
Considered supporting the local economy? Talk to the staff in the cafes and LBS or even hire a local guide if theres a few of you to cover it. If you need help on the trail most of us are pretty friendly and happy to chat.
Hope thats helpful, enjoy the woods......

speaking of boar, the last time i went, i got stared-out by mummy who had her 3 little ones on the trail by a gate.... i stayed put, and then she walked towards me. the was ok but then daddy popped out a bush about 15ft away and closing. i have to say, i got some sprint training in pretty sharpish